Bearing for grain-drills, &amp;c.



S. E. DAVIS & H. B. BOZARDP BEARING FOR GRAIN DRILLS, 6w.

APPLICATION FILED AUG. 27. 1908.

934,291 Patented Sept. 14, 1909.

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I 7 an: lllll S. E. DAVIS & H. 1B. BOZARD.

BEARING FOR GRAIN DRILLS, 6m.

APPLICATION FILED AUG. 27, 1908.

934,29 1 Patented Sept. 14, 1909.

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, selves to our invention only when embodied stra a rrnn'r anion.

'srnN'cnn E. Davis, on MINNEAPOLIS, MINNESOTA, A'N n HannIsoN n. eczema,or INcoLN, NEBRASKA; SAID BOZARDNASAS1G1\ITOYR or ONE-HALF or HIS RIGHTTO MONITOR DRILL 00., or MINNEAPOLIS, MINNEso'rA.

BEARING non enaIN-nninns, &e.

Specification of Letters Patent.

Patented Sept. re, an.

Application filed August 27, 1908. Serial No. 450,539

To all whom i may concern:

Be it known that we, SPENCER E. DAvIs and HARRISON B. BOZARD, citizensof the United States, residing, respectively, at Min-' neapolis, in thecounty of Hennepin and State of Minnesota, and Lincoln, in the county ofLancaster and State of Nebraska, have invented certain new and usefulImprovements in Bearings for Grain Drills, &c., and do hereby declarethat thefollowing is a full, clear, and exact description of the same,reference being had to the annexed drawings, making a part of thisspecification, and to the figures of reference marked thereon.

As is well known, the conditions under which the bearings for graindrills, corn planters, and otheragricultural machinery, having disks orrevolving devices for opening a furrow, or for pulverizing purposes,operate, are extremely severe both on account of the great strains towhich the parts are necessarily subjected by reason of the manner ofmounting or supporting them, and because of the dirt in which suchmachinery operates, which, finding its way into the, bearings, rapidlycuts and destroys them.

The object of our invention is to produce a bearing by which will beeliminated the unbalanced strains that have characterized such bearingsheretofore, thereby eliminating the wear due to that condition, whichwill be so constructed as to resist wear for a prolonged period, andwhich will be practically dust-proof, as far as access of dirt or gritto the bearing surfaces is concerned, so as to obviate the wear orcutting of parts by the direct action of the grit, as well as, inconsequence of or in conjunction with, conditions of unbalanced strainsor pressures. We attain these objects, as well 'as theproduction of abearing that may be perfectly lubricated and is extremely simple by thebearing constructed substantially as hereinafter specified and claimed.

We illustrate our invention as adapted to and embodied in a grain drill,but of course by selecting the grain drill to illustrate our invention,we do not thereby restrict ourin grain drills.

In the accompanying drawings, Figural is a side elevation of a graindrill disk and cordance'with our invention, looking at theconvex side ofthe disk; Fig. 2 a horizontal section on the line'22 of Fig. 1; Fig. 3a. horizontal section on the line 33 of Fig. 2; Fig. 4 a view similar toFig. 2, illustrating a somewhat difi'erent embodiment of our invention;and Fig. 5 a detail. view in perspective illustrating the manner ofuniting the cups forming the box by riveting.

To the extent that our bearing consists of a journal or hub 10 that issupported by a boot- 11, and a box on the concavo-convex -disk 12, bywhich the disk is revolubly mounted upon the journal or hub, our bearingis similar to those that are old. We make the peripheral orcircumferential bearing surface of the journal or hub perfectlycylindricalinstead of inclined or conical as has been the caseheretofore,'and the bearing surface which it.

engages on the box is likewise cylindrical, and such bearing surface onthe box is on a ring or sleeve 13 that fits within a ring 14 attached tothe disk 12. The box-forming ring 13 is extended beyond the convex sideof the disk 12 where it has an inwardly turned flange 15 which overlapsand engages the adjacent fiat side of the ournal or hub, while thebox-forming ring 14; is extended on the concave side of .the disk, andhas a closed head or end 16 against which the other flat side of thejournal or hub bears,

and centrally in said head or end is provided an opening closed by ascrew plug 17 for the introduction of a lubricant into a lubricantchamber or cavity 18,'provided,asis customary, in the side of thejournal or hub. It will be observed that by extending the box or thedisk-bearing member 011 both sides of the disk, so that a portion of thejournal or hub is on the convex side of the disk and a )ortion on theconcave side, 'those portions beingpreferably equal or substantiallyequal, '(Fig. 4 showing them equal and Fig. 2 not quite equal) willsecure the important advantageof a balanced bearing for the disk,thereby eliminating the great strains that are caused when the bearingis, as is the case in prior constructions, wholly or substantiallywholly on one side of'the disk. Besides the avoidance of undue strainsand consequent tendencies to wear by arranging portions of the bearingon both sides of the disk, another important advantage secured is theprevengreatfriction of the disk on the shield wearsor cuts the edge ofthe shield away, pro

ducing an opening or space between the edge of the shield andthe disk inwhich grass and weeds may lodge, and thereby preventing the seed fromdropping to the bottom of the furrow and resulting in its bein tscattered on the top of the soil. With our bearing the disk is sorigidly supported that it is impossible for it to have lateral orsidewise movement or play enough to cause any wear of the shield so thatthe seed is delivered uniformly to the bottom of the seed bed opened bythe disk and shield.

The contacting surfaces of the journal or hub, and the box-formingmembers, .are so formed, and the parts are so assembled that suchsurfaces are held with sufficient tightness or closeness together as tobe dust-proof, and yet enable the lubricant to find its way between theabutting surfaces of the journal or hub and the end wall 16 of the boxmember and between the peripheries of the hub and the ring or sleeve 13and the side of the hub and the flange 15. The fit is so close that inactual use ifv there befino lubricant in the lubricant chamber, after afew revolutions of the disk the friction of the parts 1 will producesufficient heat and expansion as to cause the disk to become set orlocked so that it will'no longer revolve, and this behayior of thebearing has the important advantage that it compels the a plyingof thelubricant in order to enable t e drill to be used, and by preventing itsuse without a lubricant prevents the cutting or wear of the parts thatwould occur were the bearingused withoutanylubricant. With the lubricantresent in the bearing, the heat generated y the friction is sufficientto produce such a state of fluidity of the lubricant as to enable it toreadily ass over the surfaces hereinbefore referre to,.which isnecessary for the proper lubrication of the bearing, and this state offluidity and this operation or action of the lubricant takes placebefore the parts of the bearing can be sufficiently heated to cause themto be set'or locked.

In order to secure the tight side contact of the journal or hub and theboxes above described, and also to enable compensation v or take up forwear, we preferably screw the bearing ring or sleeve 13 into thedisk-carrying ring 14, cutting thread 20 on the external periphery ofthe ring or sleeve 13, and corresponding thread on the internalperiphery of the ring 14, and provide in the flange 15 of the rin orsleeve 13 notches 21 for engagement y a spanner wrench for turning 6 thering or sleeve 13. However, as illusmay be fixedly and permanentlyunited by trated in Fig. 4, the twobox-forming rings riveting, lugs 22being provided on the edge of the ring or sleeve .13 which projectthrough slots or holes 23 in the end or head 16 of the rin 14:, andupset or headed down .on the outsi e thereof. Y In the embodiment ofour'invention illus.-

trated in Figs, 1, 2 and 3, the box-forming I rin 14 is made separatefrom the disk 10 an the two'are'joinedftogether by means the disk, thereWill be no tendency to tear or pull apart the ring and the. disk inconse quence of the great pressure or strains on the disk, because thelatter are against the concave side thereof, so that the disk is pressedagainst the flange all the more firmly or tightlyby reason of thepressures or strains developed in the operation of the machine. However,we. contemplate forming the disk bearing member 14: integrally with thedisk instead of separate therefrom and attached to it as We have justdescribed, and we illustratesuch a construction in Fig. 4. In this case.the. disk box-bearing member 14 is formed by drawingor'pressing it fromthe stock from which the'disk is made.

An important factor contributingto the enduring or lasting character ofour'bear-j ing, so that it may be termed an indestructible bearing, isthe use of hardened metal in making the box-bearing members as well asthe hub or journal. We preferably use case .hardened steel, but ifdesired chilled iron may be used, and when we use the term hardenedmetal we mean metal hardened as by the case-hardening of steel or thechills ing of iron vWhen we make the disk-carrying box member integralwith the disk, as illustrated in Fig. 4, we make it of chilled iron, andin order to provide the hardened metal bearing for the hub or journal inthe construction illustrated in Fig. 4, wherein the ring or sleeve 13 isriveted to the ring (the use of riveting precluding the employment ofhardened metal) we interpose between the hub or journal and the ring,13, a hardened metal bearing ring 26.

For attachin our bearing to the boot 11, a tapering stu 27, on the sideof the hub or journal on the convex side of the disk, is inserted in asimilar opening in the boot, andthe parts are clamped or held togetherby a bolt 28 secured to the hub or journal with its threaded endprojecting beyond the stud to receive a clamping nut 29 that bearsagainsta washer 3O engaging the bottom ofan annular cavityin the outerside of the boot. We utilize the boot to protect the joints of thebearing from the access of grit 15, so that a joint is formed at thisplace upon the bearing is to press all the more point is provided withan annular shoulder or collar 32 that closely fits the innercircumference or periphery of the ring flange adding to the difficultyof access of dust to the interior of the bearing.

It will be observed that the bolt 28 is not screwed into the hub orjournal, but the head of the bolt is within the lubricantchamber so thatthe thread projects beyond the hub or journal to receive a clamping nut.A screw connection between theboltand the hub or journal isobjectionable, because since in a chilling operation, for example, if athread be used in the hub or journal, the thread will shrink unequally,so that when the bolt is screwed therein, it will strip them.

It will be observed that all of the parts of our bearing that are at allexposed to dirt and dust, are on the convex side of the disk, and wehave constructed our bearing to secure this position, because there isat leastfour times as much dirt thrown against the concave side of thedisk as against the convex side. It will also be observed that as thesuperior pressure on the disk is on the concave side, the effect of thepressure close together,the plane side surfaces that are in contact.

It will be noted that the two members of the box are cup-shape, and aswe prefer to make them, we draw them out of steel.

\Ve prefer in embodying our invention to combine in a single bearing allthe features of the balanced position of the bearing with reference tothe disk, the cylindrical contact surfaces between the hub and the box,the hard metal bearing surfaces for all the wearing parts, and theconstruction and arrangement of parts for excluding dust,'but we desireit understood that a bearing using any one or some, but not all, ofthese features of our invention, is regarded by us as embodying ourinvention, and therefore in the scope of our patent.

Having thus described our invention, What we claim is 1. The combinationof a disk, a journal having a cylindrical bearing surface, and a boxcomposed of two cup-shape members, each having an integral annularflange, the flange of one being overlapped by the flange of the other,the disk being directly supported from the inner end of the outer oroverlapping flange, and the journal being inclosed by said members, anditsopposite sides being engaged by the end portions thereof. 7

2. The combination of p a. disk, a journal having a cylindrical bearingsurface, and a box composed of two cup-shape members, each having anintegral annular flange, the flange of one being overlapped by andscrewed into the flange of the other, the disk,

being directly supported from the inner end of the outer or overlappingflange, and the journal being inclosed by said members, and its oppositesides being engaged bythe end portions thereof.

3. The combination of a disk, a journal having a cylindrical bearingsurface, and a box composed of two cup-shape members, each having anintegral annular flange, the flange of one being overlapped by theflange of the other, the disk being directly supported from the innerend of the outer or overlapping flange, and the journal being inclosedby said members, and its opposite sides being engaged by the endportions thereof, and the journal having a lubricant chamber closed bythe end wall of the outer cup-shape member. I

In testimony whereof we afiix our signatures in presence oftwo'witnesses.

SPENCER E. DAVIS. HARRISON B. BOZARD;

\Vitnesses \VILL L. WARNER, H. G. FREEMAN."

